Machine for providing pin-shafts with heads of glass.



No. 723,392. n PATENIED MAR. 24, 190s.

I. W. JUNGBEGKIIII. MACHINEv POR PROVIDING PIN SIIAITS WITH HEADS 0F GLASS.

API/.IOATION FILED DEO. 10, 1901.

SIS/8S:

UNITED STATES g PATENT OFFICE.

THEOBAIID WILHELM JUNGBEOKER, OF AIX-LA-OHAPELLE, GERMANY.

MACHINE FOR PROVIDING PIN-SHAFTS WITH HEADS OF GLASS.

SPECIFICATIO forming part f Letters Patent No. 723,392, dated March 24, 1903. Y Application led December l0, 191. Serial No'. 85,342. (No model.)

` To all whom it may concer-m Be it known that L-THEOBALD WILHELM JUNGBECKEE, manufacturer of needles,a sub# ject of the King of Prussia,-Emperor of Germany, residing at Nos. 11 to 15 Rosstrasse, Aixla-Chapelle, in the Kingdom of Prussia, Empire of Germany, have invented certain new and useful Improvements in Machines for Providing Pin-Shafts with'Heads of Glass; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to a machine for providing pin-shafts with heads ofegla'ss, in which the glass rod furnishing the material for the glass heads is automatically advanced to provide the blunt ends of the pinshafts with glass inthe exact ratio as required for the proper provision of said pinshafts with heads'of glass. l sions are made in this machineto not only accomplish the formation of the glass heads automatically by means more fully described in another part of this specication, but also to give the glass heads thus formed a perfectly symmetrical shape and a faultlesslysmooth surface, two prominent features of an ideal piu-head, which by the means at present employed in this art are seldom, if ever, attained.

In the accompanying drawings, Figure 1 is a plan view of the machine,vpartly in sectionlv Fig. 2 is a longitudinal sectional view on the"` Fig. 3 is a transverse secenters' the thread ofthe above-named screws.

line A B of Fig. l. tional view on the line C D of Fig. 1.

To the base 1 are secured the brackets 2 and 3, supporting the equally-pitched screws 4 and 5 for conveying the pin-shafts to the point where they are provided with heads of glass. The ends of thescrews 4 and 5, journaled in the bracket 2, protrude through the latter and are provided with the wheels 6 and 7, respectively meshing with the wheel 8, forming, like the bevel-wheel 9, an integral part of the sleeve 10,*seated upon the stud 1l, secured to the bracket 2. The four wheels mentioned receive their motion from the bevel-wheel 12, secured to the driving-shaft 13, journaled in the small brackets 14 and 15 and receiving its motion by means of the Further provii grooved pulley 16. The free ends of the screws 4 and 5 are resting upon the points of the. adjusting-screws 17 and 18, respectively, thus allowing of adjusting said screws when dead motion occurs and reducing friction.

The plate 19, carried bythe head of the bracket 2, and the'plate 42O, adjustably secured in a transverse bar 21, fastened to the ends of the vertical posts 22'and 23, form the receptacle for the pin-shafts. "At the rear of said posts is secured another transverse bar 24, having a slot 25 to receive the Vertical end 26 of the bar 27, placed midway over the screws 4 andr and carrying on its under side a'strip of rubber 28 or any other soft material capable offcreating sufficient friction upon the pin-shafts to -cause their rotation when being conveyedto the place where they are provided withheads of glass and afterward advanced until 'they leave the threads of the screws 4 and 5. To adjust the pressure upon said pin-shafts, the transverse bar 24 is provided with the set-screw 29 and the free end of the bar 27 held down by the' iiat spring 30, secured to the bracket 3.

The pin-'shafts 31 are resting between the plates 19 and 20 and will by their own weight enter the thread of the screws 4 and 5. In order that no more than one pin-shaft may enter the thread of said screws and keep the pin-shafts at the place where they enter said y"thread at all timesin plain View of the oper- 'ator, the end of plate 20 is cut out in such a manner that only a narrow tongue32 is left standing over each of the screws 4 and 5, thus 'exposing each pin-shaft to full View before it YIf now the sha'ft 13 be revolved inthe direction of-its arrow,AFig. 2,-the screws 4 and 5 will revolve in a direction indicated by the arrows in Fig. 3, thus creating a tendency to move the pin-shafts to the right. To prevent their traveling off the screws 4 and 5, laterally due to the transverse motion of the same, a bar 33 is secured to' the vertical post 2,2 and the bracket 3, and in order to reduce the friction to a minimum the bar 33 is faced on its side next to the screw 4 with a strip of glass 34, reaching from the bracket 3 to nearly acrossthe inner lsurface of the post 22, so that the point of the pin-shaft when entering the thread of the screws 4 and 5 will bear against rco said strip of glass. To provide means for arranging the pin-shafts between the plates 19 and 20, so that they may enter the threads of the screws 4 and 5 without interruption, a plate is held up close to the side of plate 19 by the small bracket 36, screwed to the bracket 2. The inner end of said plate 35 and the end of the strip of glass 33 overlap each other, as may be seen in Fig. 1, thus preventing any of the pin-shafts 31 from getting with their points into this joint.

The burner 37 consists of the two branches 38 and 39, a forked rod 40, projecting upward from between said branches, and the lower tube 41, provided with the flange 42 and the threaded lower part projecting through the slpt 43 of the base 1. Over this threaded part of the burner is screwed the elbow 44, to which is secured a rubber tube leading to a point from whence the necessary quantity of the mixture of gas and air is drawn. The glass rod 45, supplying the material for the heads of glass, rests at one end in the forked rod and at the other end in a casing forming part of the tube 46, secured to the slide 47, working on the rod 48. This rod 48 is lixed to the arm 49, securely attached to the under side of the base 1 by means of the screws 50. Motion is imparted to the slide 47 by means of the cord 51, attached with one end to the eye 52 of the slide 47 and with the other to the drum 53, seated upon the vertical shaft 54. This shaft 54 is journaled in the sleeve 55, secured to the base 1, and carries on its upper end the grooved disk 56, provided with the knob 57, whose use will be eX- plained farther on. The cord 58 connects vthis disk with the smaller disk 59, secured to 'the vertical stud 60, revolubly held to the base 1 ina similar manner as the shaft 54 by means of the sleeve 6l, and receives its motion from the cord 62, running over the grooved disk 64 on the stud 60 and over the small spool 63, secured to the end of the driving-,shaft 13.

Upon rotating the shaft 13 the pin-shafts 31, resting between the plates 19 and 20, will drop one after another into the threads of the screws 4 and 5 and advance toward the double-armed Bunsenburner 37 in a continuons row separated from each other equal to the pitch of the screws 4 and 5. The glass rod 45, resting with one end against the inside of the tube 46, will be advanced by the above-described mechanism just fast enough to deliver sufficient material to the blunt ends of the pin-shafts as they-advance and reach the first arm 38 of the Bunsen burner. As the pin-shafts are continually kept in rotation during their advance each of them will in its proper time be provided with a quantity of glass sufficient for one head. This head will, however, after having severed .its connection with the glass rod be of a somewhat irregular shape,and to'correct this is met by the liame of the second branch 39 of the burner 37, where the pin-head will massa be remelted, and as it is kept rotating al1 the time it will acquire the shape of a spheroid, closely attaining the shape of a perfect sphere having a faultlessly-smooth surface. The pins are kept in rotation until they have reached the end 0f the bar 27, when they may be removed or kept in motion by the screws 4 and 5 until they leave the threads thereof.

It sometimes happens that the glass rod will crack, and pieces thus separated will drop down andform a gap between the passing pin-shafts and the fractured end of the glass rod. To prevent such number of pinshafts from being provided with heads of glass as naturally would pass the flame of the burner-arm 38 before the fractured end of the glass rod 45 could reach the point of contact with the passing pin-shafts again, the disk 56 is provided with a knob 57, by means of which the operator ymay wind up the cord 51 upon the drum 53, thus bringing the glass rod into contact with the pin-shafts again Without disturbing the other workingparts in their operation, as the cord 58 will slip sufficiently' for this purpose upon the small disk 59. For this reason thetransmission of motion from the driving-shaft 13 to the drum 53 by means of cords is preferred to any other driving medium.

Modifications of the details of construction shown may be made and any other suitable proportions may be used without departing from the spirit of my invention.

I claiml. A machine for providing pin-shafts with .heads of glass comprising a base or frame, a pair of equally-pitched and parallel to each other arranged conveying-screws, drivingshaft and intermediate means for imparting rotatory motion to said conveying-screws, means for admitting the pin-shafts one by one to the conveying-screws, means for keeping the pins continuously in rotation while resting in the threads of said conveying-screws, a two-armed Bunsen burner having a forked rod to carry therein the one end of the glass rod, a slide with a tube carrying on its end a casing for the reception of the other end of said glass rod, means for advancing the glass rod in a direct proportion to the amount of glass required for the formation of the pinheads on the pin-shafts passing the glass rod in a continuous succession, consisting of an arm lsecured to the under side of the base of the machine, a rod in said arm, the beforementioned slide working on said rod, a drum on the lower end of a vertical shaft, a flexible medium connecting said drum and said slide, a stud revolubly secured upon the upper face of the base, and a series of disks on said vertical shaft a-nd stud receiving their motion from the shaft driving said conveying-screws, substantially as shown and described.

2. In a machine for providing pin-shafts with heads of glass the combination of a base, brackets thereon, a pair of equally-pitched conveying-screws rvolubly mounted in said brackets, a drivin g-shaft carrying driving elements, an intermediate gearing train for transmitting motion from the driving-shaft to said conveying-screws, means for carrying the pin-shafts before they enter the threads of the conveying-screws, and for admitting the pin-shafts one by one to the conveying-screws, means holding down said pin-shafts While 'resting in the threads of said conveyingscreWs and causing their rotation When'advanced by said screws, means for preventing the pins from leaving the conveying-screws While resting in the thread thereof, means for keeping the glass rod in contact with the blunt ends of said pin-shafts, a two-armed Bunsen burner melting with one iame the glass rod and with the other remelting the imperfectly-formed head of glass, and means for automatically advancing said glass rod proportionate to the demand for the material 

